Strangely click bait title. None of the contents of the article indicates a severe back and forth or her having strong negative feelings towards the democratic socialists (progressives?). It all seems to stem from:

• Voting against additional war funding for Israel but the dissenting voices were all clumped together in a statement that retained support for self-defense. All other statements from her outwith this as linked or quoted appear to be anti-Zionist.
• She doesn’t hand out endorsements like candy, but also doesn’t necessarily condemn those she doesn’t endorse, i.e. she isn’t engaging in schoolyard politicking.